Pacbrake’s flagship product, the PRXB (pressure
regulated exhaust brake), is the unquestioned leader in the supplemental
brake industry. The patented PRXB design delivers the strongest braking
horsepower, greatest speed reductions and shortest stopping distances
possible without the use of service brakes. It maintains optimum retarding
performance by maximizing the exhaust backpressure throughout the entire RPM
range. Unlike a typical exhaust brake, which requires high RPMs to work
properly, the PRXB delivers constant exhaust pressure (braking) as early as
1200 RPM through to the maximum allowable RPM.

Chev/GMCDuramax 6.6 LB72001Chev/GMCDuramax 6.6
LB72002Chev/GMCDuramax 6.6 LB72003Chev/GMCDuramax 6.6 LB72004